- take away (arrest, freeze, whatever) the elite's real estate in the west
- same thing with other assets, banc accounts etc
- ban them from living in the west or going to the west on vacation, for medical treatment.
- ban their families from living in the west, their kids from studying there.
this is not my idea, you will find similar suggestions a hundred times in different forms on the Russian-speaking internet.
maybe there is no legal base right now to do it as described, but the alternative is broad sanctions that hit the small people harder then regime collaborators.
edit: formatting
US, EU and UK profit from oppressive regimes and don't have any interest of actually hurting them. And why should they? They have their own people to think of.
This characterization is simply naive.
True, it's not like the western powers are shouting their support from the rooftops. But they are more than happy to play ball with these regimes (including high-level military cooperation and lucrative trade agreements) as long as it it doesn't get, you know, "too" embarrassing for them to do so.